According to a study by Lancaster University, the addition of green walls in city environments could reduce the amount of particulate matter (PM) by 60% and the amount of Nitrogen Dioxide (NO2) by 40%.
Previous studies, the report states, had not taken into account the enhanced residence time of air in street canyons, giving much lower benefits for green walls. The report concluded that the “judicious use of vegetation can create an efficient urban pollutant filter, yielding rapid and sustained improvements in street-level air quality in dense urban areas.”
Green walls require irrigation to allow them to thrive in harsh city environment – Access Irrigation can design and supply appropriate systems.
For more information on the report: http://pubs.acs.org/doi/abs/10.1021/es300826w